Model comparison
Grok 4 Fast vs Kimi K2 Thinking Turbo
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.4 to 39.0 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Grok 4 Fast scores higher in 2 categories and Kimi K2 Thinking Turbo in 6 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 43.2.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Kimi K2 Thinking Turbo | |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 39.0 | 45.4 |
| Released | 2025-09-19 | 2025-11-06 |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 21 |
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Category by category
Coding Kimi K2 Thinking Turbo leads
Grok 4 Fast: 32.3 (#264), Kimi K2 Thinking Turbo: 38.1 (#166)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena WebDev | 1160 | 1322 |
| LMArena Coding | 1429 | 1454 |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), Kimi K2 Thinking Turbo: —
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Kimi K2 Thinking Turbo leads
Grok 4 Fast: 22.5 (#179), Kimi K2 Thinking Turbo: 31.4 (#72)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1428 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| Chess Puzzles | — | 20% |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |
Math Kimi K2 Thinking Turbo leads
Grok 4 Fast: 36.1 (#126), Kimi K2 Thinking Turbo: 45.5 (#62)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Math | 1419 | 1429 |
| OTIS Mock AIME 2024-2025 | — | 83.1% |
Knowledge Kimi K2 Thinking Turbo leads
Grok 4 Fast: 31.5 (#211), Kimi K2 Thinking Turbo: 50.9 (#64)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Expert | 1411 | 1439 |
| GPQA Diamond | — | 84.2% |
| Vectara Hallucination Rate | 19.7% | — |
Multilingual Too close to call
Grok 4 Fast: 51.5 (#106), Kimi K2 Thinking Turbo: 51.6 (#104)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | 1397 | 1398 |
| LMArena Chinese | 1458 | 1457 |
| LMArena French | 1433 | 1425 |
| LMArena German | 1383 | 1390 |
| LMArena Japanese | 1358 | 1356 |
| LMArena Korean | 1359 | 1329 |
| LMArena Russian | 1387 | 1390 |
| LMArena Spanish | 1414 | 1407 |
Instruction Following Too close to call
Grok 4 Fast: 73.4 (#116), Kimi K2 Thinking Turbo: 74.2 (#103)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | 1388 | 1403 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Kimi K2 Thinking Turbo: 43.2 (#99)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | 1415 | 1415 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Too close to call
Grok 4 Fast: 60.2 (#96), Kimi K2 Thinking Turbo: 60.2 (#99)
| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | 1407 | 1415 |
| LMArena Creative Writing | 1388 | 1373 |
| LMArena Multi-Turn | 1414 | 1414 |
Frequently asked questions
Is Grok 4 Fast better than Kimi K2 Thinking Turbo?
Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.4 to 39.0 on the Noometry Index.
Is Grok 4 Fast or Kimi K2 Thinking Turbo better for coding?
Kimi K2 Thinking Turbo scores higher on coding benchmarks: 38.1 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Kimi K2 Thinking Turbo share?
18 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Kimi K2 Thinking Turbo has 21.